>> how was your parents' relationship, do you remember? >> they would fight. it was an interesting relationship. there were times we were like the perfect family, we'd do like fun family stuff. and then there were times i do remember being woken up at night by my parents' fighting. >> reporter: for the first time, someone inside the lovelace family was revealing the turmoil before cory's death. but then the detective asked lyndsay to describe that tuesday in 2006 when her mother's body was found. >> tuesday morning, before you went to school, what do you remember? >> the answer seemed to take the air out of his theory of the case. >> she was up and walking around -- she had made breakfast. i don't remember what we had for breakfast. but she had like made us breakfast and she was helping us get ready for school because we all had our little valentines day boxes. >> the young woman -- candid about her parent's troubled marriage was nonetheless supportive of her father's account. cory ha died minutes after seeing her children off to